//
//  UIBarButtonItem+Extension.swift
//  YXweibo
//
//  Created by AS on 5/14/16.
//  Copyright © 2016 AS. All rights reserved.
//

import UIKit

/// 扩展UIBarButtonItem
extension UIBarButtonItem
{
    /// 便利构造函数, 在扩展中只能添加便利构造函数
    convenience init(imageName: String, target: AnyObject?, action: Selector) {
        // 创建按钮
        let button = UIButton()
        button.setBackgroundImage(UIImage(named: imageName), forState: UIControlState.Normal)
        button.setBackgroundImage(UIImage(named: imageName + "_highlighted"), forState: UIControlState.Highlighted)
        button.sizeToFit()
        
        // 设置点击事件
        button.addTarget(target, action: action, forControlEvents: UIControlEvents.TouchUpInside)
        // 创建UIBarButtonItem, 需要调用自己的指定构造函数
        self.init(customView:button)
        
        
    }
    
     /// 创建带按钮的UIBarButtonItem, class表示类方法, 类名.方法名()
    class func createBarButtonItem(imageName:String) ->UIBarButtonItem{
        
        let button = UIButton()
        button.setImage(UIImage(named: imageName), forState: UIControlState.Normal)
        button.setImage(UIImage(named: imageName + "_highlighted"), forState: UIControlState.Highlighted)
        button.sizeToFit()
        
        return UIBarButtonItem(customView: button)
        
    }
    
    
    
    
    
    
    
    
    
    
    
    
    
}
